lol.. crj makes a good lowering kit for just about everything.. friend ran this kit on his raptor
Yamaha blaster rear lowering kit rear kit
front end kit
Front Lowering Kits
they also make prob the best stud style spacers on the market to
ATV wheel spacers
i know guys that have used tthe crj studs for mx and NEVER brike or bent anyhting..
and well your at it check out the diamond j widening kits
Yamaha Blaster 200 | Diamond J Customs | Quad-Rodding Systems & Suspension Kits
anmd as for flat track.. you talkin dirt or ice?? i know the bigger quads such as banshee's 250r 400exs and so on run a shorter rear swing arm.. like -1 or -2 on a blaster you shouldnt need it, as for how low, low enough that you feel comfortable.. i did oval track with my blaster on ice... stock high and could keep up with 400exs ltz400s and so on with a stock blaster